Updating a model instance with extra checks.

Hi everyone, I'm looking for the proper django way to do an update of an attribute on my model instance, but only if the attribute current value is checked agains't a condition, in an atomic way, something like this: def use_money(self, value): begin_transaction() real_money = F('money')

Re: Updating a model instance with extra checks.

the user's money the sum of all their transactions (credit - >> debit). >> You get lesser performance, but you also get history! >> >> Maybe you could try (not sure about that): >> >> MyModel.objects.filter(money__gte = value, pk = self.pk).update(F...) &